Yarn guard for double twist spindle assembly



April 11, 1950 J. K. COCHRAN 2,503,936

YARN GUARD FOR nouaus TWIST SPINDLE ASSEMBLY Filed April 20, 1948INVENTOR.

JOHN hi COCH/PA/v Patented Apr. 11, 1950 poration oi Delaware YARN GUARDFOR DOUBLE TWIST SP INDLE ASSEMBLY John K. Cochran, Conyngham, Pa.,assignor to The Duplan Corporation, Hazleton, Pa., a cor- ApplicationApril 20, 1948, Serial No. 22,064

Claims. (Cl. 57-58) This invention relates to textile yarn spinning andtwisting and particularly to double twist spindle apparatus andoperations.

In spinning and twisting textile yarns in which a double twist isimparted to the yarn, a so-called double twist spindle rotates at highspeed coaxially within a yarn supply spool holder which is relativelystationary. The yarn from the spool passes downwardly through the centerof the spool holder assembly and the spindle is an overend relationship,thence transversely outwardly from the spindle and upwardly throughspace to a take-up spool located above the yarn supply spool. A yarnguide rotor is attached to the double twist spindle to guide the yarn asit leaves the spindle. This yarn guide rotor rotates with the spindle.Since the yarn guide rotor is cupshaped, partially enveloping the yarnsupply package carrier, an air gap results between these two parts ofthe apparatus. This air gap separates the rotating part from thestationary part and, as a result, air currents are induced thereinduring operation.

It has been found that these air currents alternately flow in oppositedirections, that is, inwardly toward the center'of the rotating spindleand outwardly into space. The inwardly induced air current in this gaptends to draw the yarn and other waste material into the gap between therotating parts. Also, the yarn, being drawn inwardly toward the air gap,rubs against the upper edges of the guide rotor and the package carrierso that unless these surfaces are made perfectly smooth, the resultingwear adds to yarn breakage.

The obvious expedient of covering this air gap with a thin annular stripis not satisfactory since the outer end of the air gap merely is locatedin a different position and the air currents are not eliminated. Thisproblem has vexed those engaged in double twist spinning textile yarns.

Therefore, it is an object of this invention to provide a method andapparatus for preventing yarn and other waste from being drawn betweenthe rotating and stationary parts of a double twist spindle assembly.

It is another object of this invention to provide a guard covering theair gap between the rotating and stationary parts of a double twistspindle assembly.

It is another object to provide a method and apparatus for altering oreliminating the influence on the yarn of the induced air currentsbetween the stationary and rotating parts of a double twist spindle.

Further objects will 'be apparent from the tollowing'description, claimsand drawing in which: Figure 1 is a cross sectional view of a doubletwist spindle and yarn spool holder assembly with ends cut away andshowing the yarn guard in position; and

Figure 2 is a plan view of the guard.

With reference to the drawing, a double twist spindle H comprisesa'hollowed blade portion l2 and a whorl portion I3. Transverse outletsl4 and 15, located at the juncture of the blade and whorl portions,provide passage outwardly for the textile yarn passing through thehollowed blade I2.

A rotor member comprising a take-up disc portion It and a yarn guideportion I1 is firmly attached to the spindle so that the take-up disc I6is in alignment with the transverse outlets l4 and I5 of the spindle.The yarn l8 passing outwardly through passage I4 or ii of the spindle iswrapped partially about the take-up disc 16 and guided upwardly throughspace by the rotor guide l1. The rotor comprising the take-up disc l6and the guide I! rotates with the spindle.

The yarn supply spool holder comprises fundamentally a tubularsupporting member 2! attached, in a preferred form, to an annularcupshaped member 22. Thespool holder is supported in co-axialrelationship with and by the spindle II by means of roller orball-bearing assemblies 23 and 24. The inner race of each of thesebearing assemblies is attached to the blade portion l2 of the spindlewhile the outer race is attached to the tubular portion 2| of the spoolholder. Normally this apparatus is mounted at an angle and a weight ofany preferred form is supported within the annular cup-shaped member 22to retain the spool holder substantially stationary, while the spindleII and its rotor assembly rotates at a high speed.

As may be seen in the drawing, an air gap 25 separates the rotatingrotor guide II from the relatively stationary package carrier member 22.This air gap 25 extends to the bearing. It has been found that, duringthe operation while the rotor I1 is rotating at a high speed, anunstable vacuum condition is produced in the air gap 25 in the space 25'near the bearing assembly. This unstable condition in the air gapinduces an air flow alternating in direction within this annular space.When the air flow is inwardly the thread ot yarn I! and other wastetends to be drawn into the gap. Although in many instances the yarn maynot be drawn into the gap, it may contact theupper edge of the rotatingrotor guide I1 or the 3 annular cupmember 22 and the resultant wearcauses breakage.

In accordance with this invention, a centrally apertured circular disc3| having a flanged outer edge 32 is located in co-axial alignment withand supported by the spool holder. This annular disc extends outwardlyacross the open end of the air gap with the flanged outer edge extendingdownwardly about the annular upper surface of the rotor guide H. Thedisc or guard 3| may be supported in any desired way by the yarn supplyspool holder and thus becomes one of the stationary elements of theassembly. In a preferred form, as illustrated, an annular channel 33 isformed in the upper surface conforming to the shape of the annularcup-shaped member 32. With this particular construction the disc 3| maybe held by friction on the yarn supply holder. It will be apparent thatother means may be used to support this yarn guard.

The rotating rotor guide I! creates an air stream flowing outwardly andupwardly from its outer surface as illustrated by the arrow 4|. This airstream indicated by the arrow 4| will be more than suflicient to supplythe demand created by the induced air current flowing into the air gap42 between the flanged edge 32 of the disc 3| and.

the outer surface of the rotor ll. Thus, any inwardly flowing aircurrent within the air gap 25 and the air gap 42 will be supplied by theinduced air current from the rotating yarn guide ll. At the same time,since the air current indicated by the arrow ll from the rotor guide llis more than sufficient to supply the demand of the induced current inthe air gap 25, there will be a flow of air outwardly from the flangededge 32 of the yarn guard or disc 3|. In this way, not only is thedemand of the current within the air gap 25 fully met, but the excessair flow created by the guide I! causes the yarn I8 to be forcedoutwardly or away from the open end 42 of the air gap. With thisconstruction there is no tendency of the thread of yarn H! or otherwaste material to be drawn within the air gap 25.

By covering the open end of the air gap 25 and relocating the end of thegap by means of the. flanged edge 32, to a position along the side ofthe rotating rotor ii, a completely satisfactory though simple solutionhas been found for the problem.

While the preferred form has been illustrated and described, it will beapparent that modifications are possible without departing from thescope of the invention.

What is claimed is:

1. In a double twist spindle assembly for textile yarns havingstationary and rotatable parts, and an air gap between said parts, ayarn guard comprising a centrally apertured circular disc having aflanged outer edge, said disc covering said air gap.

2. In a double twist spindle assembly for textile yarns, a yarn guardcomprising a centrally apertured circular disc having a flanged outeredge, the upper surface of said disc covering the air gap betweenrotatable and stationary parts of said assembly, said flangedouter edgeextending over the upper outer surface of the rotating parts of saidassembly.

3. In a double twist spindle assembly for textile yarns comprising ayarn spool holder and a double twist spindle having a yarn guide rotor,a guard comprising a centrally apertured circular disc having a flangedouter edge, said guard being supported by said spool holder and havingsaid flanged edge extending downwardly over and about the outer edge ofthe yarn guide rotor.

4. In a double twist spindle assembly for textile yarns having arotatable spindle and a stationary yarn supply package holder and an airgap between the rotating and stationary parts, a centrally aperturedcircular disc covering the open end of said air gap, said disc having aflanged outer edge extending downwardly over the outer edge of therotating parts of said spindle.

5. In a double twist spindle assembly for textile,

yarns, a yarn guard comprising an annular strip having a flanged outeredge, said annular strip covering the air gap between rotatable andstationary parts of said assembly, said flanged outer edge extendingover the upper outer surface of the rotating parts of said assembly.

6. In a double twist spindle assembly for textile yarns havingstationary and rotatable parts and an air gap between said parts, a yarnguard comprising an annular disc having a flanged outer edge, said disccovering said air gap.

7. In a double twist spindle assembly for textile yarns, a rotatablespindle having a rotor guide attached thereto and a stationary spoolholder, there being an air gap between said spool holder and saidrotatable rotor guide, a centrally apertured circular disc covering saidair gap having a flanged outer edge extending about the upper surface ofsaid rotor guide.

8. In a double twist spindle assembly for textile yarns comprising ayarn spool holder, a double twist spindle in co-axial relationship withsaid spool holder, said spindle having a yarn guide rotor attachedthereto, said spindle being rotatable within the relatively stationaryspool holder, a centrally apertured circular disc having a flanged edgeand supported by said spool holder, the upper surface thereof coveringthe gap between said rotor and said spool holder and the flanged edgethereof extending downwardly about the upper outer edge of said yarnguide rotor.

9. In a double twist spindle assembly for textile yarns having astationary annular cup-shaped supply package and a rotatable spindlehaving a yarn guide, there being an air gap between said package carrierand said yarn guide, a centrally apertured circular disc having achannel surface conforming to the shape of said package carrier andsupported thereby, said disc extending across said air gap and having aflanged outer edge extending downwardly about the upper outer surface ofsaid yarn guide.

10. In textile yarn spinning and twisting operations in which there arerotating and stationary parts separated by an air gap, the method ofpreventing the yarn and waste material from being drawn into the air gapby the induced air current therein which consists in creating an aircurrent tangentially outwardly from the outer surface of the rotatingpart and introducing a portion of said created air current into said airgap to satisfy the inwardly induced current requirement thereof.

JOHN K. COCI-IRAN.

No references cited.

Certificate of Correction Patent No. 2,503,936 April 11, 1950 JOHN K.OOCHRAN It is hereby certified that error appears in the printedspecification of the above numbered patent requiring correction asfollows:

Column 1, line 10, for the word is after spindle read in;

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in thePatent Oflice.

Signed and sealed this 4th day of July, A. D. 1950.

THOMAS F. MURPHY,

Assistant Uommissz'oner of Patents.

